this post was submitted on 13 Sep 2023
693 points (97.7% liked)
Programmer Humor
32739 readers
672 users here now
Post funny things about programming here! (Or just rant about your favourite programming language.)
Rules:
- Posts must be relevant to programming, programmers, or computer science.
- No NSFW content.
- Jokes must be in good taste. No hate speech, bigotry, etc.
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Linux mostly doesn't use file extensions... It relies on "magic bytes" in the file.
Same with the web in general - it relies purely on MIME type (e.g.
text/htmlfor HTML files) and doesn't care about extensions at all."Magic bytes"? We just called them headers, back in my day (even if sometimes they are at the end of the file)
The library that handles it is literally called "libmagic". I'd guess the phrase "magic bytes" comes from the programming concept of a magic number?
I did not know about that one! It makes sense though, because a lot of headers would start with, well yeah, "magic numbers". Makes sense.